Automatic clamping holder



Nov- 23 1926. 1,608,144

' A. K. SUTHERLAND AUTOMATIC CLAMPING HOLDER Filed-March 28, 1925 FIG.Z

INVEN TOR WITNESSES C r W E I v I AM ATTOQNEY Patented Nov. 23, 1926.

"UNITED STATES PATENTOFFICE.

ALEXANDER K. sornnnrnnn, OF MILWAUKEE, iscons n, assrenon r MOE- BRIDGES COMPANY, or MILWAUKEE, isconsin, A CORPORATION or wrsconsnv'.

AUTOMATIC- cLAMrrna" HOLDER.

Application filed. March 28, 1925. Serial No. 19,054.

This invention has for its, object to provide a holder for the globes of lighting fix tures and the like which will automatically clamp the globes without danger of breaking the glass and in which the weight of the globe will serve to maintain the clamping engagement and prevent accidental disengagement. s

Another object of the invention is to perfect details of construction of such an automatic clamping globe holder to make it inexpensive tov manufacture andyet strong and durable. 1

With the above and other objects in view the invention consists in the automatic clamping holder as herein claimed and all equivalents- Referring to the accompanying drawings in which like characters of reference indicate the same parts in different views,

Fig. 1 is a central sectional view of a lighting fixture embodying the automatic clamping globe holder of this invention,

Fig. 2 is a bottom view thereof with the globe and lamp removed;

Fig. 3 is a sectional view on an enlarged scale showing in dotted lines the withdraw- 'al of the clamping arms, and

Fig. 4 is a bottom view of the hinge plate to which the arms are pivoted.

In these drawings, 10 indicates the ordinary suspending chain and 11 is a bail supported thereby. A ring 12, preferably of sheet metal,is mounted on the parallel arms of the bail 11 and is preferably clamped be tween nuts 13 threaded thereon. A shell 14 slidably fits on the parallel arms of the bail and is provided with a downwardly extending annular flange 15 within which fits the flaring edge of the glass globe 16.

A boss 17 is riveted to the upper end of the shell 14 and through it slidably passes a tubular stem 18 held in adjustment by a set-screw 19 and having threaded on its lower end a yoke 20 carrying a lamp socket 21, in which is fitted the incandescent lamp 22.

Also "secured to the shell 14, preferably by means of the riveted boss 17 is a hinge plate 23, shown in detail in 4, with downwardly turned ears in which are pivotally mounted the outwardly bent ends of U-shaped clamping arms24 so that they are free to swing. These clamping arms 24 are preferably of wire, as shown, and are curved, as in Figs. 1 and 3, and pass through openings 25 in the ring 12. This curvature of the arms causes them to swing on their pivotal connections when therev is relative vertical movement between the shell and the ring, as shown'by dotted lines inFig. 3, the

weight of the shell and the globe supported by it giving the arms a tendency to spread apart soas to clamp the edge of the. globe gainst the flange of the shell.

Inoperation the shell islifted bysliding it along the parallel arms of the bail,-thus causing the clamping arms 24 to be drawn away from the flange of theshell to admit the flaring edge of the globe. Then, with the shell resting on the globe, the, latter is lowered and theinovementsof the shell on the parallel arms of the bail cause the clamping arms 24 to slide through the openings 25 of the ring and the curvature of said arms causes them to swing outwardly into clamping engagement with the edge of the globe, where they will be held by the weight of the globe and of the shell. There is no possibility of the globe being accidentally released as when set screws are relied on and the clamping engagement is not such as toinjure the globe for the arms engage well within the globe and away from the edges thereof, as best seen in Fig. 3. Y I

.11 order to release the globe it is only necessary to lift it and by means thereof move the shell along the parallel arms of the bail, thus causing the clamping arms 24 to be withdrawn and then, while holding the shell in this position,-the globe may be removed.

By means of the automatic clamping holderof this invention the globe may be quickly attached or removed without danger of breaking the glass and a firm clamping engagement is assured that is incapable.

of working loose by vibration or jar and there is no danger of stripping threads or of chipping the edge of the globe as with set screw clamping means.

hat I claim as new and desire to secure by Letters Patent is:

1. A globe holder comprising a bail memher having parallel arms, a guide ring secured to the ends of said arms, a shell slidably mounted on the bail member, bent arms pivotally mounted on the. shell and passing through openings of the guide ring whereby movement of the shell on the bail member causes the arms toswing outwardly to engage Within a globe.

2. A globe holder comprising a bail-Sus pending member, a ring mounted on the ends thereof, a shell surrounding the ring and tree to move vertically with respect thereto, said shell adapted to receive-the edge of a globe, arms pivotally mounted on the shell and passing through the guide ring and adapted to swing out *ardly to engage within the globe by a downward movement of the shell with respect to the ring.

A. globe holder comprising a bail-suspending member, a guide ring secured to the ends thereof, a on the bail member and adapted to receive the edge of a globe, bent arms pivotally mounted on the shell and passing through openings of the guide ring and adapted to be moved toward the edge of the shell for clan'iping the globebetween them under the "veight of the shell and the globe.

4c. fin electric lighting fixture comprising a bail having parallel arms, a guide ring mounted thereon, a shell siida'oly mounted on the parallel arms of the bail and having an annular depending flange, a globe havshell slidably mounted ing allaring edge fitting within the flange, a hinge plate'seoured to the shell, U-shaped wire arms with their ends pivot-ally mountin the hinge plate, said arms being curved and passing through openings 'otthe ring,

the bail within the flange, a boss riveted to the shell,

and having a downwe 'dly extend-y mg flange, a globe withitsedge fitting" a hinge plate secured to the shellby means oi? the U-shaped wire armspivotally conn cted with the hinge plate, said arms gaging wvithin, the globe near; the a tubular stem edjnstably slidable 'h the boss, a lamp socket mounted on the stem, and a lamp fitting in the socket.

tl'irough openings of the guide ring in testimony whereof, l allix my'signa- ALELennon-n K. snail-IRELAND, 

